<div class="shadow">
  <h3>hello shadow</h3>
  <div class="head bg-primary">
    <ng-content select=".head"></ng-content>
  </div>
  <div class="body">
    <!-- <ng-content></ng-content> -->
    <ng-content select="[content]"></ng-content>
    <ng-content select="article"></ng-content>
  </div>
  <div class="head bg-danger">
    <ng-content select=".foot"></ng-content>
  </div>
</div>

<app-dialog [visible]="true">
  主体内容
</app-dialog>